Application of Conductivity Meter in the Dairy Industry

In order to ensure consistent product quality, the dairy manufacturing equipment used is not only made of the highest grade materials, but also requires cleaning and maintenance to minimize the possibility of contamination during product or batch changes. This process is called in-situ cleaning.

During the in-situ cleaning process, conductivity measurement is used to determine the effectiveness of cleaning and rinsing equipment in contact with the product. The conductivity in in-situ cleaning indicates the start and end time of the flushing process by capturing changes in the conductivity of the sample flow. For example, in a rinsing cycle, a low conductivity indicates that all chemicals in the process flow have been washed clean and can proceed to the production of the next batch of products.

During the production of dairy products, dairy companies must thoroughly disinfect all process equipment that comes into contact with the finished product to prevent bacterial contamination and product accumulation. The in-situ cleaning system thoroughly cleans components that come into contact with liquids, such as storage tanks, containers, fermentation tanks, process pipelines, embedded sensors, etc. The in-situ cleaning process can control the pre rinse flow, cleaning, and post rinse cycles, including alkaline rinse, acid rinse, and water rinse cycles.

Conductivity sensors are key components in the design of in-situ cleaning systems. The conductivity of various washing solutions should be higher than that of the rinsing water and the final rinsing water. Due to the "reusable design" adopted by many systems, sensors can monitor the strength of the washing solution, as chemicals are removed through continuous cleaning cycles. Conductivity measurement can indicate whether additional cleaning is needed. To ensure thorough disinfection of all components of the equipment, conductivity sensors can be used. Low conductivity indicates completion of rinsing and cleaning processes.

Several facts about conductivity
The dairy industry is an ideal application for conductivity measurement, as the conductivity varies at different stages of the processing.
Conductivity is a measurement of the conductivity of a solution and can provide important indicators for water quality during the manufacturing process.
To carry an electric charge, a solution must contain charged particles or ions. Most conductivity measurements are conducted in aqueous solutions, and the ions that affect conductivity come from electrolytes dissolved in water.
The following are typical electrolytes:

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